The U.S. Department of Justice is investigating venture capital giant Andreessen Horowitz (a16z) for potential antitrust violations stemming from overlapping board memberships at competing artificial intelligence companies. The probe, which has been ongoing for nearly a year, focuses on whether a16z partners improperly served as directors on rival firms offering similar data analytics services, according to sources familiar with the matter.

What Exactly Is a16z Being Investigated For?

The investigation centers on two a16z-backed companies: Databricks and Fivetran, both highly valued private technology firms specializing in large-scale data collection, organization, and analysis services. Ben Horowitz, co-founder of Andreessen Horowitz, serves on the board of Databricks, while partner Martin Casado sits on the board of Fivetran. Additionally, Casado previously served on the board of dbt Labs, a similar company that Fivetran acquired in June.

The core issue is what regulators call "interlocking directorates," a practice where individuals or institutions serve on the boards of two directly competing companies. This arrangement can create conflicts of interest and raise concerns about whether sensitive competitive information might be shared or whether one company could gain unfair advantages through board-level insights into a rival's strategy.

The DOJ's investigation began around the same time the agency was reviewing Fivetran's acquisition of dbt Labs, which was publicly announced in October 2025 and ultimately approved without conditions. However, the antitrust probe has continued even after the acquisition was completed.

How Have Regulators Handled Similar Cases in the Past?

The standard approach to resolving interlocking directorate concerns is straightforward: require directors to resign from the board of one of the competing companies. During the Biden administration, this resolution method was used repeatedly. Directors from over ten companies, including Live Nation Entertainment, chose to step down to eliminate conflicts of interest. In one notable example, Ari Emanuel, then CEO of Endeavor Group Holdings, resigned from the Live Nation board in 2021. Between 2022 and 2023, directors from over a dozen other companies also stepped down to address similar concerns.

These actions were driven by the Department of Justice under former Assistant Attorney General Jonathan Kanter, who invoked the rarely used Clayton Act of 1914 to combat interlocking directorate practices. The legal framework covers both individuals and entities, and some courts have already accepted the interpretation that venture capital firms themselves, not just individual partners, can be subject to these restrictions.

Why Does This Matter for a16z and the Venture Capital Industry?

The investigation into Andreessen Horowitz carries particular weight because of the firm's enormous influence and resources. As of January 2026, a16z managed assets of $90 billion, making it one of the most well-capitalized venture capital firms globally. The firm recently completed a $15 billion fundraise, the largest single fundraising in venture capital history, with funds allocated to startups across all sectors.

a16z's portfolio includes some of the most valuable private companies in the world. Databricks, for instance, announced a new funding round of $5 billion last week, valuing the company at $190 billion. Ben Horowitz has been involved with Databricks since leading its first $14 million funding round in 2013, positioning himself for a potential return of tens of billions of dollars. The firm is also a major investor in other high-profile companies, including SpaceX, which went public in June, and has positioned itself to invest in OpenAI, which plans to initiate its initial public offering soon.

What makes the a16z case unique is that the controversy stems not from a single individual serving on competing boards, but from multiple partners of the firm doing so. This distinction could become a legal battleground. While applicable legal provisions cover both individuals and entities, a16z can potentially challenge the government's allegations by arguing that the law was designed to address individual conflicts, not institutional ones.

Steps Regulators May Take to Resolve the Investigation

• Board Resignations: The most likely outcome would be requiring Ben Horowitz to step down from the Databricks board or Martin Casado to resign from the Fivetran board, eliminating the direct conflict between the two competing companies.
• Structural Separation: a16z could implement internal policies to prevent its partners from simultaneously serving on the boards of competing portfolio companies, creating a firewall that addresses the firm-level conflict.
• No Action: According to sources familiar with the matter, the Department of Justice has not yet determined the next steps, and it is possible that no action will be taken as a result of the investigation.

What Role Does a16z's Political Influence Play?

The timing and trajectory of this investigation also intersect with a16z's significant political engagement. The firm has maintained close ties with the second Trump administration, and its technology investment portfolio stands to benefit from deregulatory policies. Some members of the a16z team have actively advocated for these policies in Washington.

In 2024, Ben Horowitz and co-founder Marc Andreessen each donated millions of dollars to organizations supporting then-presidential candidate Trump. The organization is also a major voice in artificial intelligence policy and successfully advocated for the current administration to roll back several safety regulations on AI applications. In the second half of 2024, Ben Horowitz also donated $2.5 million to a super PAC supporting Democratic presidential candidate Kamala Harris.

This political positioning raises questions about how the investigation will proceed under the current administration. The DOJ has not yet determined its next steps, and the outcome could depend on broader regulatory priorities and political considerations.

For founders and investors in the venture capital ecosystem, the a16z investigation underscores a growing tension in how venture firms manage their expanding portfolios. As firms like a16z grow larger and invest in more companies within the same industry verticals, the likelihood of board-level conflicts increases. The resolution of this case could set important precedents for how venture capital firms structure their governance and manage competitive relationships among their portfolio companies.